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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c03a76b2efaa3c19a960f25ad3012fa9991fbe8559823bf1895a2671a9315e' 
  AND token = 'huJRYwkbty1EwOhB3z1kNzIRoq65wuvsxjpznx8OCLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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