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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98235381dcc94bdbdb8ee5ac0ad4f4b5dc89fac6e380feb558b2ab2cf978d412' 
  AND token = '6Y9v0RMyn1Q60i7rr8eTLZTbTakjGpo0DlrGFo/RYXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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