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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbfc4cf0bf5b37095cdeb0c08b528da5f2fb11f0919b5fbcca332ca7674525c0' 
  AND token = 'shur9Tcv+bT71gcWzA+j/B7EKIcbyySz1WLJgRNY++c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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