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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503d7a7dde76ed72021df21baa442a0f2a9e39a08ffefe7ac0ae3a1c85672f2e' 
  AND token = 'q2Ep2qWb4RlVrf0Y50wl9u2jzMESvfpTRDE4CTJQ0AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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