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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9fdfed77a4fe1455e6ceccc1df10e8556a1d7daa050d0b05d0d889379b29753' 
  AND token = '55R/VrN2GSXppTtE54FLSD6BajPis8f6T5Anf4mqS14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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