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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85779c9e746e906472ea8337e8a668728c0a8452d094ce2f6237718fb7d1947d' 
  AND token = 'ueAEE1YJNZB4/RWZVXBeYAQ3d4q7G9+2FqWI48D4eTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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