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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1c3dd015ffc14abb76922b53e9fbb9edbecbb12735c487b89b1e86c8accba5d' 
  AND token = '3WZytSxOKZklRfFBerNUgbqgcbL4us96hQixQYUQm3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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