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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a579d0ca1656cb0efad12501b0ea2b4e9c6952032f4c7c9fae219a1403fd0b9d' 
  AND token = 'eVBeH3aAHMcBQFdouP5AoXGH5+TK+1xHDOSXnJX29bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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