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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c9147250182019ecbd92cc4a18594ce44a6d10d238ae26ee238407e34e51b5' 
  AND token = 'phqidLiZv2KT9Tbeg0qmuEKUnDPSgaHkwbtTJ0d+se0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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