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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a102eb9cd318a7936610dd0a7d448e6b9df7d40e39fe80c2037e4380af62c88b' 
  AND token = 'taFL+/TzplVB1HydRhB7rOJ44WbAfynPO8anLXoy/EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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