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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '295979cb38c4e6a6d0b304141c2ab4af977bfa30827f6087d05be9e304f7fd25' 
  AND token = 'rqcL3/Lqw+BYfmFdRov8uHL9A19rFTnb29kWiYcvMc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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