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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83b7d3a0636daa102300fe4c7a99078610fae694c30a72dd991676b2c9343d61' 
  AND token = 'Y70s2vZ0sIwcY9f+VocN/JnAfRvB4aanrJ+Kg82D90w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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