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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14dad6cdf228c8dd94ae960a0b810978244f22e45560d6d985555d594e6f9561' 
  AND token = 'FeYMU1UEqm9YM+3Ixo/l5QP1Fvw9PEKjNJ6QxPQ+s2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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