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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fc1402cbac1515d06954f870b506f3050c52debc8c93cd54c322bcf878a4a3f' 
  AND token = 'ii0bKD9PN+9nw/OlW9nFDIGtVZtwhsMv8afx1kj9BZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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