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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0f3753e3aa9d42b8b08252243a6987e5eba179a2ccf1a9787722fccd321422' 
  AND token = 'P3oIsCfrtozp+V240HSCIVII+/HTIDvtFCOkIC5Sliw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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