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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a3ef5a2e3672045db9185892d63c9ec08ae4213c3053a760ca148e3aff4603' 
  AND token = '0ce4OSpkru2G/n5ZWXmRQEJZ5UaEvGoIVtQ+Ul3Xn2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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