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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ba765658f49681dd7791851ca30ec319d79f1b7c6eee65c0cf64fcf504e807' 
  AND token = 'posDMjDpMhnCNxfmmeGyL7tr+pJhRx2B5ilGPbJZ5RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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