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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '775ac4873b1165362b77faa275f8c4e84e9ac89a1137de6f29607b822045971d' 
  AND token = 'MQknRG/W93+bo+BDG4l/lUlBcS2RMgjTjhkepMeNDiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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