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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49259d24baae79a3cd740b8f34e3ef85b634a591c62fd93d9509784aa0cc9c42' 
  AND token = '76V9QgQOYQaFG1cf8ely6OaTDE6cVOuShewU1AoDwr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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