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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65cb0719dda316478d1d4ed461b8552aa8bab0af7ef76d447f15c07a459cecc4' 
  AND token = 'edWLtL+WqDy+g5FQ9GVaPQ116S/BG6L6snEbleMVv/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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