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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80ac634440f8684f9418ea3ca0a7b49338aa4b00ba8dd142c5c56c73e4bfb435' 
  AND token = 'yeM9FojoGivZtrX33+S44wiNbxQC2/Lu35CT2H0NcdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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