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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ca74ae2d0a2082cf7f0e5a22cdb5db2e76f5283225acced742687575835675a' 
  AND token = '5LLOGmP5MFpo5Prxpnm31RD73eEyigdvPtESQAVFHl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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