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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2397b94ca292f9750ef1157cd957d41eeee0bd0f3fc64e032cc18dfa1830c9f1' 
  AND token = 't7Q4u0aAyW7PxzVW1O2spM0NOQlefiF8lLda62iZ0jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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