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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b39f3d132dbbee90d8751a08c8a9f16fd6983214bfe53d1aa95fdae884088c' 
  AND token = 'nXGELbG+klQJTNwzbkcEGE1h16ybyeuU8ToB6s5C7LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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