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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7c6296c6f2b6ba6d2d981f75915fe62f75ecee1f832fe89276c001491362f9' 
  AND token = 'lApfR4hwZXf5OPUf2XgT/L/SuenmkMwZAOuD88gC6ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}