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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237b8947afd7d62c1e3dad2160ac530844ddeca6cb190e5a882def48577aa389' 
  AND token = 'Uuia+xgsK+jrfW3exaC2fc4DNmScwi4iewBCY5RoOP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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