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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '653139a3bd0378679e3a9180d8dd21bfb5dacafde038581159e2e8d76d50b7da' 
  AND token = 'CvmjeYyw3lCAKtCEFpvcOH3d513cGgTQNIUwZHisd24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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