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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5652ea247c0292415b084bc589ce29eca37ca67a1c04e6e9b91f8db0b07e5a70' 
  AND token = 'FXARJ+s6xXUaAgBeeCutRuTHniV+GqGdDfQfVt99yRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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