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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '973b9b66445586ae86b4ed364eb8fdfd3d33e3812602be17f3f547dbf306286c' 
  AND token = 'ssgA6C0sBMb1mzTW3G4HvoAbt7MSb2hkNUWjWgOmDAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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