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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '785103c9525b1a615b99891027e7acc7a5e4d19495c50bcb19b319e0293e97d2' 
  AND token = 'VljZRak0Il97DH4T30mWJUk4WMfvFv5S7JNn84GlW4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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