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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268b60bb346ad5b1b8c0c6f88027e65a1173d0bb550abb25bb59ea3db27c65ce' 
  AND token = 'hF8VB6NLLspNO02+yAm9GRXRkO5QCBDY+n2n70Rz380=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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