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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0f0add7882158bb1ee551583f570dc44083d1c1f7297ae7bd16345d7d80ee9e' 
  AND token = 'x/cFE0ile6XbqkveQmJtCmFmSbMpNCJTLW0FiJ4cKlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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