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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb0b505a1af5d0878ba8999c0502b51fda27d8044cf57d29e16f4ceb781f469' 
  AND token = 'svs+1tcN+DyFOL7kPBBdXINHGoqwaFPz5EgElYClO3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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