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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a15d18d1abfeb2d25a563d5f0b9d57f4f9854da68f196f30b151f1a2f0e416a8' 
  AND token = '1w7x2jCSa+rNHIkl2Wn0Hom+boemIKIDy0GKpIirWZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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