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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512a7fdc3ac8cb534ab506c2a09022d14d47efee846aa1a0004d426b760045b6' 
  AND token = '95aEFf7EYZPFL171rZVAasRhAl+s5PcKEZ+jULyM5IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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