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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847b123ff95cf2cd709d69ee9051256a6060aca26325493814e0f923dc1a7c74' 
  AND token = 'bznc3CDV7D4y6tl/CuTg3FgZChFp6T7Ls6TXjm9nKOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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