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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826d9875cf8e5eec36ecbaba0c0b5feb5e64f5f5df8a8e17c528dce1ff14eb21' 
  AND token = '2Wvx9shF9GWrAz1mdPPsBM3FxHczIbbg0BD5Huf4ehw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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