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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdce0b4f4296e6c85566fa47e1f9ac42217090ca49398fc4f868dde228c5a31e' 
  AND token = 'Bop5ZfsFv+dv0I5IIFP9fyegisWVeqVsN7fPdL047/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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