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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86f2eb579be18bafbae1e0bed9b6735a7fdf441c4e6d4e282fc92b702ea4d94a' 
  AND token = 'OCT+2qRw81uUft8jvZcKhWFw+dGAhLofcR18aJ/dgow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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