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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91348e72e52bcdd3e2a448310bb68fed51f9454cc48208477d69321945af7aab' 
  AND token = 'XOa1DFEv1gGC6JXnktbF4iYAl1BxsmtTP6qlUtoEvu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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