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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f32c11f8458c4b1d46c1e52d10306bd06f384ff15e184ca84d69000ddbe57f' 
  AND token = 'At1whvKPfacYXyhfQtKpQTt5dXAnKEJ591d/V8zHssQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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