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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc9692a3523a6e663d15ea9471913744662c3c5aa76e55c179c007ad2422fa41' 
  AND token = '3lmgkeNaKDw0xOQQ8Lh9mxl//l5rXMBEfk9VosVrR2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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