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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34041e35098123927a2da4810f9e6494793e75f5377b001f91f5d37234b2605e' 
  AND token = 'YuPWvaqc40TF93Nom2+ovjGDzGKnDOX7pnyBaVaqaD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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