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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd170b64c94ba5420f2a32892a0edcd73aa64c03c907ac719f7c0f8a4fcafc835' 
  AND token = 'PFflt2wd0Yib7hnV3JSdAz1kT+6Yuf50iJMMTOAwk/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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