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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae30c91697dd2b6b6ea40f790f80df3261e902d2bbbe126b5075f206d0a2e9e' 
  AND token = 'OA72uQYskF0TnN9xGmbqxettnzO9RzNCL3WoA5++sX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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