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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75d7b4db19ce35d84e19abbab5bb5defbe585035b1c5d3a1dd86b1086b11b968' 
  AND token = 'ZgqW9GJN8QYzXS+QXhIjm1noIl96gx8XO+JDJ49YlBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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