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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bcc31fb1fe039f4429dde54e57e26d8da5751d30b81ab3dea277bd3ffbcb02a' 
  AND token = 'zKQx8cDzTLF9WkG0TVEGv/NabmJF78nB+6ak3XezcX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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