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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c32b3a93651fed3b412047a989e5750cd2fda7ada91a5c24836162e4b547a5' 
  AND token = 's1VjdIVVVJf1owX2i7lILU7U2LixUW0q+CPMJPYkeuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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