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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6027f3f6652ae53664640eb89d7ba4358ead915bb0c8e82a6d218805a59a209b' 
  AND token = 'bl+qe0PXuISjKp7gmF3cWjhF/8c9mwRQI192iOfcAMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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